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United States Patent | 5,255,302 |
Shimamune ,   et al. | October 19, 1993 |
A device for continuously measuring the thickness of a foil includes a radiation source opposite a radiation detector, and a movement member which moves the radiation source and detector synchronously in a width-direction of the foil. A signal generator generates a signal indicating a position of a portion of the foil whose thickness is being measured, and a counter having a plurality of integrating channels integrates detection signals output from the detector to generate an integrated count number for each channel. A signal switching member switches each of the plurality of integrating channels of the counter according to signals generated by the signal generator, and a calculator calculates a foil thickness from the integrated counted number for each channel of the counter. This structure allows continuous and precise measurement of the foil's thickness.
Inventors: | Shimamune; Takayuki (Tokyo, JP); Hayashi; Tamotsu (Kanagawa, JP) |
Assignee: | Permelec Electrode, Ltd. (Kanagawa, JP) |
Appl. No.: | 845262 |
Filed: | March 3, 1992 |
Mar 05, 1991[JP] | 3-38404 | |
May 16, 1991[JP] | 3-111899 |
Current U.S. Class: | 378/55; 378/51; 378/54; 378/207 |
Intern'l Class: | G01B 015/02; C25D 001/04 |
Field of Search: | 378/55,56,54,48,50,58,207,51 250/359.1,358.1 |
4331241 | May., 1982 | Smirin et al. | 378/54. |
4928257 | May., 1990 | Yerkes et al. | 378/54. |
4954719 | Sep., 1990 | Harris | 378/55. |
5003569 | Mar., 1991 | Okada et al. | 378/54. |
5014288 | May., 1991 | Chase et al. | 378/53. |
5029337 | Jul., 1991 | MacKenzie et al. | 378/54. |
5099504 | Mar., 1992 | Pettit | 378/54. |
5103471 | Apr., 1992 | Spongr et al. | 378/55. |
5113421 | May., 1992 | Gignoux et al. | 378/54. |